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Cassini captures "mutual event" movies to refine the precision with which we know the orbits of Saturn's moons. On 17 September 2011, Cassini took four such movies in rapid succession: Tethys with Titan at about 0100 UTC; Rhea with Titan at 0130; Enceladus with Titan at about 1030; and, at the end, at 1200, a movie with Titan, Dione, Saturn's rings, Pandora, and Pan.